The fuel you use is like a lot of other things in this hobby. You are going to get a lot of recommendations, but what suits you best will depend on a lot of different things. Plane, engine, flying style, weather, physical location, and many other things can affect what you use. What works well for one person may not work well for another. Your best bet is gather up the recommendations here and then try them out to see what works well. For your application I would recommend anything from 5% - 15% fuel, either castor or synthetic lubrication. Start with those and then go out and fly each type and see what works best for you. Buying that much fuel can be cost prohibitive, so ask around at your club and see if your buddies can hook you up with a couple tanks of fuel. Try the different types and then settle on what works best for you, your plane, your flying style, and your wallet.

Thanks what I did. My fuel of choice?? Cool Power 15%. I use that in all of my glow engines, both 2 and 4 stroke.

Ken